public void ShouldReturn_2Dates() { var options = new DbContextOptionsBuilder <RegistrationContext>() .UseInMemoryDatabase(databaseName: MethodBase.GetCurrentMethod().Name) .Options; using (var context = new RegistrationContext(options)) { IRSUserRepository userRepository = new UserRepository(context); IRSSessionRepository sessionRepository = new SessionRepository(context); IRSCourseRepository courseRepository = new CourseRepository(context); var Teacher = new UserTO() { //Id = 420, Name = "Christian", Email = "*****@*****.**", Role = UserRole.Teacher }; var Michou = new UserTO() { //Id = 45, Name = "Michou Miraisin", Email = "*****@*****.**", Role = UserRole.Attendee }; var Isabelle = new UserTO() { //Id = 45, Name = "Isabelle Balkany", Email = "*****@*****.**", Role = UserRole.Attendee }; var AddedTeacher = userRepository.Add(Teacher); var AddedAttendee = userRepository.Add(Michou); var AddedAttendee2 = userRepository.Add(Isabelle); context.SaveChanges(); var SQLCourse = new CourseTO() { //Id = 28, Name = "SQL" }; var AddedCourse = courseRepository.Add(SQLCourse); context.SaveChanges(); var SQLSession = new SessionTO() { Attendees = new List <UserTO>() { Michou }, Course = AddedCourse, Teacher = Teacher, SessionDays = new List <SessionDayTO>() { new SessionDayTO() { Date = new DateTime(2020, 02, 20), PresenceType = SessionPresenceType.MorningAfternoon }, new SessionDayTO() { Date = new DateTime(2020, 02, 21), PresenceType = SessionPresenceType.MorningAfternoon } } }; var addedSession = sessionRepository.Add(SQLSession); context.SaveChanges(); Assert.AreEqual(2, sessionRepository.GetDates(SQLSession).Count()); } }